Writing instrument



FIG. 1 is a front, right perspective view of an ornamental design for a writing instrument with a transparent barrel and cap body according to the present invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top end view thereof;

FIG. 7 is a bottom end view thereof; and

FIG. 8 is a top right perspective view of a writing instrument as in FIG. 1 in a use position;

FIG. 9 is a front, right perspective view of an ornamental design for a second embodiment of a writing instrument according to the present invention;

FIG. 10 is a front elevational view thereof;

FIG. 11 is a back elevational view thereof;

FIG. 12 is a right side elevational view thereof;

FIG. 13 is a left side elevational view thereof;

FIG. 14 is a top end view thereof; and,

FIG. 15 is a bottom end view thereof.

All portions shown in broken lines are environmental and illustrative only and form no part of the claimed design. 

The ornamental design for a writing instrument, as shown and described. 